A novel activity of halohydrin dehalogenases towards spiroepoxides has been found. The enzyme from Arthrobacter sp. (HheA) catalysed highly regioselective azidolysis of spiroepoxides containing 5, 6 and 7-membered cycloalkane rings, while the enzyme from Agrobacterium radiobacter (HheC), besides high regioselectivity, also displayed moderate to high enantioselectivity (E up to >200) that can be applied for the kinetic resolution of chiral spiroepoxides. The orientations of spiroepoxides in the active site of halohydrin dehalogenases were studied by quantum-chemical calculations and docking simulations. Analyses of the complexes obtained revealed the origins of diastereoselectivity and enantioselectivity of the investigated biotransformations.
发现了一种卤醇去卤酶对螺
环氧化物的新活性。来自细菌Arthrobacter sp.的酶(HheA)催化了含有5、6和7成员环的螺
环氧化物的高区域选择性
叠氮化反应,而来自土壤细菌Agrobacterium radiobacter的酶(HheC)不仅具有高区域选择性,还表现出中等到高的对映选择性(E值高达>200),可应用于手性螺
环氧化物的动力学拆分。通过量子
化学计算和对接模拟研究了螺
环氧化物在卤醇去卤酶活性位点的取向。对所获得复合物的分析揭示了所研究
生物转化的非对映选择性和对映选择性的来源。